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Classic Mustangs Tech Forum

Technical discussions specific to 1964-1967, 1968-1970, and 1971-1973 Classic Mustang. Discuss all tech related to in-line six cylinder and V8 powered Vintage Mustangs here.

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Unread 05-15-2012   #1 (permalink)
stephena is offline Rookie


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Default replacing rear frame rails

I finally got my 65 fastback up on the rotisserie. I found the rear torque boxes need replaced along with the shackle end of the rear frame rails. I am going to have to replace the inner and outer wheel wells and the lower half of the rear quarters. My questions are:
1) would it be best to just replace the entire frame rails?
2) If I do should I just cut out the wheel wells and the lower quarter panels to make it easier to get to the frame rails?
3) The rear quarter panel extensions and the taillight panel also has to be replaced. Would it be easier to cut it out before the frame rails are replaced also?
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Unread 05-15-2012   #2 (permalink)
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I wish u had a 67 because I bought all that stuff brand new and ended up buying a hole newer car and now I dnt need it I would just about give it away, it was the kit frame rails torque.boxes and the shock crossmember
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Unread 05-16-2012   #3 (permalink)
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Default

1) It would indeed be better to replace to whole frame rail. They make full rear frame rails that include the torque boxes and they are pretty much easy to replace and you have a rotisserie so it will be twice the fun. IF the current torque boxes AND shackle ends are shot you can pretty much gurantee rust is throughout the entire rail.
2) It IS easier to remove wheel wells to get to everything. Trunk drop-offs probably need to be replaced to so just take it all off.
3) It is easier to get to the rear of the frame rails with the tailight panel off.

What helped me was doing one side at a time to keep everything square. I recommend this. You don't want to put the rear axle back on and find you are driving sideways. As you make your tacks to the trunk floor before final assembly please keep checking your squared using the other frame rail as a reference point. Take measurements before you remove anything. If helps to plumb-bomb mounting points to the floor and make marks on the floor to help keep things lined up.
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1965 Fastback 289 hi-po 3sp.
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1965 coupe 200 I6 (bench seat option)
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